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Native American FlagRome's true minions chain them down,
In ignorance from heel to crown;
In hopes, perchance that when the pope,
Is forced from Europe to elope,
He here may find a sovereign throne;
And ready serfs to bend and groan.
 -- The American Protestant Vindicator
, January 20, 1841

On the night of April 6, 1844, a mob of white Protestant males calling themselves "Native Americans" marched toward a Roman Catholic Church on Brooklyn's Court Street, intent on burning it to the ground. As they proceeded, their numbers increased to several hundred with shouts of "The church must come down—the church must be gutted—damn the Irish!" When they arrived, a sizable group of Irish immigrants were waiting to defend it with bludgeons, axes and rifles. But before they came to blows, Brooklyn's Mayor called out the military and dispersed the crowds.

From the 1830's through the 1850's, such scenes were duplicated in nearly every major American city where immigrants gathered in large numbers. But not all ended so peacefully. In Massachusetts and Pennsylvania, convents and churches were burned to the ground. From Kentucky to Maine, riots left Catholic immigrants and Protestant "natives" dead in the street. In short, anti-Catholicism had reached a fever pitch in American life, unseen before and perhaps since.

The principal reason was immigration—mainly from Ireland and Germany—which reached unprecedented proportions during these years. Roman Catholicism, once a despised minority, was now America's single largest religious denomination. (While all the Protestant denominations combined to outnumber Catholics, the latter outnumbered every individual Protestant church.)

Reaction was fierce. Would America become a mere papal outpost?

Throughout the country, newspapers with titles like The Protestant, The American Protestant Vindicator, and The Anti-Jesuit dedicated themselves to the cause of "No Popery." They proposed to defend "Gospel doctrines against Romish corruption." Debating societies addressed the question, "Is Popery Compatible with Civil Liberty?" Authors like inventor Samuel Morse wrote books warning against Jesuit conspiracies to take over the country.

Political parties were even formed, like the American Republicans and the Native Americans. (In the 1800's, the term "Native American" referred not to the continent's original peoples, but to native-born Protestants.) In 1835, the Native American Democratic Association won several offices in New York City, pledging themselves to immigration restriction and keeping Catholics out of public life. Over the next two decades, similar parties formed nationwide, but they were confined mainly to the local level.

But the most famous and influential of such groups was the American Party, better known as "the Know-Nothings." It was formed in 1849 by New Yorker Charles B. Allan under the title of the Order of the Star Spangled Banner. Members had to be born in the United States, born to Protestant parents and not married to a Roman Catholic. They had secret handshakes, passwords and signals. Prospective members were asked:

Are you willing to use your influence and vote only for native-born American citizens for all offices of honor, trust or profit in the gifts of the people, the exclusion of all foreigners and Roman Catholics in particular, and without regard to party predilections?